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- Vespa Classic
- Carburetor -DELLORTO 24mm PHDG- AU mixing tube without holes - DEL9851
The PHDG 24 mm is the largest standard size in the series and is designed for powerful two-stroke engines. Where more air flow and power reserves are required, this variant offers the right basis - from ambitious street engines to compact racing applications.
Racing carburetor Venturi 24 mm 31 / 36 mm plug-in connection Separate lubrication and vacuum connection
The 24 mm PHDG uses a large, round venturi with flow-optimized geometry to ensure a stable flow pattern even with higher air requirements. This supports engines with a significantly increased power level and ensures a powerful but easy to control throttle response.
The intake profile at the carburetor mouth is matched to the large cross-section and helps to keep the reaction when opening the throttle slide controllable, although the flow reserves are significantly higher than with smaller variants.
The aluminum housing, float chamber and slide valve ensure low weight and effective heat dissipation. This supports constant mixture preparation, especially with larger engines and longer full-load phases.
The float needle valve is available in suitable sizes, with a higher flow reserve for the 24 mm carburetor. The finely responsive idle mixture screw facilitates clean tuning in the lower range, although the size is clearly designed with performance in mind.
The slide is coated to minimize friction and wear. The cover and float chamber cap are surface-finished and combine a racing look with a robust design.
| Carburetor type | Dell'orto PHDG |
|---|---|
| Mode of operation | 2-stroke |
| Ø Venturi | 24 mm |
| Ø connection width | 31 mm, 36 mm |
| Connection type | Push-in connection (elastic) |
| Air filter connection | 46 mm, 60 mm |
| Main nozzle | 112 |
| Idle jet | 55 |
| Starter nozzle | 60 |
| Nozzle needle | W 07 |
| Mixing tube/atomizer | AU 262 |
| Nozzle needle holder | 2.0 mm |
| Float needle valve | 225 |
| Float | 4,0 g |
| Throttle slide | 40 |
| 2T mixer connection | available |
| Vacuum connection | available |
| Choke | Direct actuation (lever, pull knob ...), cable holder can be retrofitted |
| Adjustment screws | Left |
| Accelerator pump | No |
| Brand name | Dell'orto |
Note: Nozzle configuration depends on version and production batch. Check idling and choke function before starting for the first time.
Numerous PHBG tuning parts can also be used with the 24 mm PHDG, provided the Dell'orto part number is identical. In particular, 5 mm main and idle jets, mixing tubes, W needles and floats can be used across all platforms, while the slide remains PHDG-specific.
As with the smaller PHDG sizes, variants with AU and AN mixing tubes are also available for the 24 mm carburetor. The choice of mixing tube has a particular effect on the part-load range and should always be considered in conjunction with the overall engine setup.
Dell'orto PHDG 24 mm carburetor in the above-mentioned configuration (Dell'orto 09851). Depending on the version, with coordinated basic jetting and the calibration elements specified by the manufacturer.
The Dell'orto PHDG 24 mm is the right choice for high-displacement and heavily modified two-stroke engines where a large carburetor cross-section can be used effectively. High air flow, versatile connection options and the proven Dell'orto tuning logic make it the high-performance top of the PHDG series.
